The Linebreaker gets the job done, plus it kind of reminds me of that one SpongeBob meme where the Flying Dutchman asks SpongeBob to stop staring at him with them big ol eyes
More importantly, Lazav, the Multifarious has an ability that lets you copy another creature in a graveyard, keeping Lazavs original name, keeping its legendary status, and giving it the copy ability again
The easiest way is to look for your theme in your colours among Legendary Creatures (card types that can be used in advanced searches)
Assembling Tron has become significantly easier with the printing of cards like [casthaven]Sylvan Scrying[/casthaven], [casthaven]Expedition Map[/casthaven], and [casthaven]Ancient Stirrings[/casthaven], as well as powerful colorless spells to accelerate into, such as [casthaven]Karn Liberated[/casthaven] and [casthaven]Ulamog, the Ceaseless Hunger[/casthaven]